Big smiles all round but probably not.

[Plainly Tacky]

Now for all your Nigerian friends here is a quick way to make money. You just give someone a sum of dosh (donation)from about £15 to £250 in Nairas of course, and in a few days you will be sent "a donation" back so long as you have praised the site with a testimonial for being so good, and then you can "recycle".
https://smile2wealth.com/about-us/
This is the classic way of ripping off your fellow countrymen but call it what you will, it's a ponzi, pyramid or whatever name you like.
".....you automatically become the next receiving member where you will be matched to receive double of the amount you paid in less than 7days.
Once you Receive your 100% payment then the system automatically gives you another member for you to make payment to in other to recycle. Failure to make your payment within the time frame given will result to your account being blocked and deleted from the system."
Don't worry, once you get blocked (which will happen very soon), you can't make a negative testimonial and one person gets to keep your money.

[GlimDropper]

Fairly classic cash gifting. 0 Admin fees means the admin has spawned multiple free accounts that pull cash out without the initial buy in. When this crashes and burns (and it will) 90+% of those investing will lose money.

Same as it ever was.